Hello
Here is the latest OCaml Weekly News, for the week of January 16 to 23, 2018.
Archive: https://discuss.ocaml.org/t/using-lwt-log-library-for-sending-messages-to-a-syslog-server/1432/2
Deep in this thread, Hannes Mehnert said:
since you mention my logs-syslog package here, let me answer you . ;)
- Lwt_logs now moved to a separate repository (see
https://github.com/ocsigen/lwt/issues/468 and
https://github.com/ocsigen/lwt/pull/484). NB: I never used Lwt_logs and can't
answer your initial question about syslog support.
- logs-syslog "depends on lot of external libraries": my perception is
different, it requires `ocamlfind`, `ocamlbuild`, and `topkg` for building, plus
`logs`, `ptime`, and `syslog-message` (which itself depends additionally on
`astring`) at runtime.
The [logs library](http://erratique.ch/software/logs/doc/Logs.html#basics) is
very convenient to use IMHO, and has builtin support for both terminal, but also
browser console (when cross-compiling to JS). I wrote logs-syslog to solve the
exact problem - exfiltrating log messages via syslog - once logs was adopted
more widely (at least by the MirageOS community, see
https://mirage.io/blog/announcing-mirage-30-release#Logs-Where-You-Want-Them).
Others (at Docker) wrote reporters for both [Apply system
log](https://github.com/mirage/ocaml-asl) and [Windows event
log](https://github.com/djs55/ocaml-win-eventlog).
The syslog-message library does not yet support structured syslog ([RFC
5424](https://tools.ietf.org/html/rfc5424)), apart from that the logs-syslog
library supports three transports, UDP, TCP, TLS (including client
authentication) - and 3 backends: Unix (OCaml stdlib), Lwt, MirageOS. Please let
me know if you have a specific use case not covered by logs-syslog. Further
reading about the MirageOS syslog integration is available at
https://hannes.nqsb.io/Posts/Syslog
Archive: https://discuss.ocaml.org/t/ann-sequence-1-0/1441/1
Simon Cruanes announced:
I have the pleasure to announce that
[sequence](https://github.com/c-cube/sequence) has reached its version 1.0.
Sequence is a lightweight, high-performance library of iterators that is
compatible with existing `iter` functions. Sequence 1.0 is a breaking release
that comes with some simplification of the API and a bump of the minimum
supported OCaml version to 4.02 that comes from jbuilder.
[Short tutorial to see what Sequence is
about](https://github.com/c-cube/sequence#short-tutorial)
Online doc at https://c-cube.github.io/sequence/
Repo at https://github.com/c-cube/sequence
Hezekiah Carty then asked:
This is great, thank you!
Is there a writeup somewhere on how to pick between sequence and
[gen](https://github.com/c-cube/gen)? Both seem similar in intent. Is one
generally a better choice than the other?
Simon Cruanes replied:
I just wrote a basic explanation here:
https://github.com/c-cube/sequence#comparison-with-a-href-https-github-com-c-cube-gen-gen-a
. I'll try to expand it if it's not clear enough.
Archive: https://sympa.inria.fr/sympa/arc/caml-list/2018-01/msg00045.html
Damien Doligez announced:
The release of OCaml version 4.06.1 is imminent. We have
created a release candidate for your testing pleasure. Please
try it and let me know whether it works for you.
We want to know about any show-stopping bugs, especially in the
compilation and installation phases.
This release candidate is available as an opam switch:
opam switch 4.06.1+rc1
Happy hacking,
-- Damien Doligez for the OCaml team.
4.06.1
------
### Bug fixes
- MPR#7661, GPR#1459: fix faulty compilation of patterns
using extensible variants constructors
(Luc Maranget, review by Thomas Refis and Gabriel Scherer, report
by Abdelraouf Ouadjaout and Thibault Suzanne)
- MPR#7702, GPR#1553: refresh raise counts when inlining a function
(Vincent Laviron, Xavier Clerc, report by Cheng Sun)
- MPR#7704, GPR#1559: Soundness issue with private rows and pattern-matching
(Jacques Garrigue, report by Jeremy Yallop, review by Thomas Refis)
- MPR#7705, GPR#1558: add missing bounds check in Bigarray.Genarray.nth_dim.
(Nicolás Ojeda Bär, report by Jeremy Yallop, review by Gabriel Scherer)
- GPR#1470: Don't commute negation with float comparison
(Leo White, review by Xavier Leroy)
- GPR#1538: Make pattern matching compilation more robust to ill-typed columns
(Gabriel Scherer and Thomas Refis, review by Luc Maranget)
Archive: https://discuss.ocaml.org/t/ann-containers-2-0-alpha1/1454/1
Simon Cruanes announced:
I have the pleasure to announce that containers 2.0+alpha1 is being released.
[containers](https://github.com/c-cube/ocaml-containers) is a modular,
ightweight, and performant extension of the standard library. Version 2.0
introduces a monomorphic mode (thanks to @jpdeplaix) that is designed to prevent
errors caused by the polymorphic "magic" operators such as `(=)`. This breaking
release is also the occasion to switch to dune, and to fix some inconsistencies
in the API (mostly printers).
If you use containers, please give a try to 2.0+alpha1 and report any issue on
the bucktracker!
tag: https://github.com/c-cube/ocaml-containers/releases/tag/2.0%2Balpha1
changelog: https://github.com/c-cube/ocaml-containers/blob/2.0%2Balpha1/CHANGELOG.adoc
Here is a sneak peek at some potential future features of the Ocaml
compiler, discussed by their implementers in these Github Pull Requests.
- stdlib: add Pervasives.int_size
https://github.com/ocaml/ocaml/pull/1572
- MPR#7710: ocamldep -sort: treat cyclic dependencies as an error
https://github.com/ocaml/ocaml/pull/1578
Here are links from many OCaml blogs aggregated at OCaml Planet,
http://ocaml.org/community/planet/.
Full Time: Compiler Engineer at Jane Street in New York & London
http://jobs.github.com/positions/9e8ba450-e72e-11e7-926f-6ce07b7015c8
Full Time: Software Developer (Functional Programming) at Jane Street in New York, NY; London, UK; Hong Kong
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